A WDM network fault detection terminal device

Abstract

The present invention relates to a WDM network fault detection terminal device, which includes a CWDM channel analyzer, a channel switching measurement module, a CWDM module, and a passive optical network connected in sequence. The CWDM channel analyzer is also connected with a wireless communication module and a human-computer interaction module. The CWDM channel analyzer includes an MCU. The passive optical network is provided with two optical fiber interfaces, and when in use, the passive optical network is connected in series in the WDM network through the two optical fiber interfaces. Compared with the prior art, the present invention has the advantages of real-time online detection, simple operation, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber communication testing, and more particularly to a WDM network fault detection terminal device. Background Art

[0002] With the popularization of fiber to the home, the investment in maintaining a huge network is getting higher and higher. At the same time, with the development of the Internet, the growing demand for network bandwidth, the implementation of various selective services, the consideration of the economic cost of network upgrade and transformation, etc., the characteristics and advantages of WDM (Wavelength Division Multiplexing) gradually emerge in the transmission system, showing broad application prospects. This is a laser technology used to increase the bandwidth on the existing optical fiber backbone network. More precisely, WDM multiplexes the close spectral spacing of individual optical fiber carriers in a specified optical fiber to increase the transmission capacity of the optical fiber. Conversely, given a certain information transmission capacity, the total number of optical fibers required can be reduced, thereby reducing the cost of laying optical fibers. In a WDM network, the number of upstream and downstream optical signals often corresponds. During the information interaction process, a group of upstream and downstream optical signals complete communication through a corresponding response mechanism. CWDM is a low-cost WDM transmission technology for the access layer of metropolitan area networks. CWDM only has passive devices. A sudden change in the generated loss in an optical add-drop multiplexer or human errors such as improper connection will interrupt the normal transmission in CWDM. For example, connecting to the wrong port or plugging into the wrong filter port. To track or repair these situations, only the power values of the transmission signals of each wavelength can be viewed. Since there are multiple bands of optical signals transmitting in the WDM network, and the spectral response of an ordinary optical power meter basically covers 850 nm to 1800 nm, as long as one or several optical signals are transmitting in the WDM network, the ordinary power meter can measure their power values, but it cannot identify the wavelength or verify the expected wavelength.

[0003] To solve this problem, there are currently three existing methods: First, directly measure the spectral lines in the WDM network through a spectral analyzer to locate faults. Although it can measure the wavelength and optical signal-to-noise ratio with high precision, it is expensive, large in size, and inconvenient to carry. Second, disconnect the main optical path of the WDM network and measure the light after demultiplexing the light in the WDM network through a demultiplexer. This will cause the optical signals in the originally normal channels to be unable to be transmitted smoothly, resulting in service interruptions for communication operators and users. At the same time, when locating faults, it is necessary to measure the upstream and downstream channels separately and record data to determine whether there is a fault in the upstream channel or the downstream channel. The operation is cumbersome and error-prone, and the efficiency is low. Third, connect the channel analyzer in series to the main optical path of the WDM network. Only a momentary interruption of the network is required to detect faults in the WDM network. Only a single measurement is needed to determine which wavelength has a fault. However, this solution must determine whether the wavelength with the fault comes from the upstream channel or the downstream channel. Currently, the wavelengths of the upstream channels and downstream channels in each province and region are different. Therefore, two CWDM modules must be used to distinguish the wavelengths of the upstream and downstream channels, resulting in high costs and being unfavorable for the miniaturization design of the channel analyzer. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a WDM network fault detection terminal device that can perform real-time online detection and has a simple operation.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A WDM network fault detection terminal device includes a CWDM channel analyzer, a channel switching measurement module, a CWDM module, and a passive optical network connected in sequence. The CWDM channel analyzer is also connected to a wireless communication module, a human-computer interaction module, and a storage module. The CWDM channel analyzer includes an MCU. The passive optical network is provided with two optical fiber interfaces, and when in use, the passive optical network is connected in series to the WDM network through the two optical fiber interfaces.

[0007] Further, the CWDM module includes several filter plates with different wavelengths.

[0008] Further, the WDM network fault detection terminal device further includes a storage module, the storage module is connected to the MCU, and the model of the MCU is MIMXRT1052CVL5B.

[0009] Further, the passive optical network includes an optical splitter and an optical combiner. The optical splitter is connected in series to the WDM network through two optical fiber interfaces. The optical splitter, the optical combiner, and the CWDM module are connected in sequence, and the optical combiner is connected in parallel with the optical splitter;

[0010] Further, the channel switching measurement module includes an AD amplification unit and a photoelectric detection unit connected to the AD amplification unit. The photoelectric detection unit includes a channel switching circuit and a plurality of photodetectors connected to the channel switching circuit;

[0011] The AD amplification unit includes a gear switching circuit and a plurality of AD amplification circuits with different amplification factors connected to the gear switching circuit;

[0012] The optical splitter splits the upstream light and downstream light on the main optical path of the WDM network according to a set ratio. The optical combiner takes a part of the upstream light and downstream light for wavelength multiplexing and sends it to the CWDM module. The filter splits the multiplexed signal. One photodetector corresponds to detecting the split signal of one wavelength. The MCU controls the gear switching circuit to switch to the photodetector corresponding to the wavelength to be detected, and controls the channel switching circuit to select the amplification factor of the AD amplification circuit. The split signal is input into the MCU after passing through the AD amplification circuit. The MCU obtains the analysis result, including the optical power signal and fault information, and stores it in the storage module.

[0013] Further, the wireless communication module is a Bluetooth module. The model of the Bluetooth module is FSC-BT822. The human-computer interaction module includes a liquid crystal touch screen and a key unit. The liquid crystal touch screen displays the detected wavelength power value, fault information, and historical records, and sends control instructions to the MCU through the key unit to view the analysis result, select the wavelength to be detected, and set the alarm fault value. The MCU sends the analysis result to the mobile terminal of the staff through the Bluetooth module.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention connects the passive optical network in series on the main optical path of the WDM network through two independent optical fiber interfaces. The upstream and downstream light on the main optical path are transmitted normally. The passive optical network only obtains a small part of the signal in the main optical path for the CWDM channel analyzer to perform optical power detection, realizing online real-time monitoring and fault location of the optical power of different wavelengths. There is no need to disconnect the main optical path. Without knowing the wavelengths of the upstream and downstream light, the WDM network fault location can be achieved through one measurement. It has strong versatility, and at the same time ensures that the optical signals without faults in the main optical path communicate normally. The detection result can be received and displayed through the human-computer interaction module. The channel switching measurement module can select the signal to be detected, realizing remote online measurement of the optical power values of each wavelength in the main optical path of the WDM network, with high efficiency, simple operation, and not easy to make mistakes;

[0016] (2) In the present invention, an optical splitter and an optical combiner are connected in parallel. The optical combiner combines the upstream light and the downstream light collected by the optical splitter and then inputs them into the CWDM module. Only one CWDM module is required to measure the optical power values of the upstream and downstream lights simultaneously. The structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic structural diagram of a passive optical network. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0020] A WDM network fault detection terminal device, such as Figure 1 , includes a CWDM channel analyzer, a channel switching measurement module, a CWDM module, and a passive optical network connected in sequence. The CWDM channel analyzer is further connected with a wireless communication module and a human-machine interaction module. The CWDM channel analyzer includes an MCU, and the model of the MCU is MIMXRT1052CVL5B, such as Figure 2 , the passive optical network includes an optical splitter and an optical combiner. The optical splitter is connected in series on the main optical path of the WDM network through two optical fiber interfaces, and the optical combiner is connected in parallel with the optical splitter.

[0021] The CWDM module includes a plurality of filter wafers with wavelengths of 1271, 1291, 1311, 1331, 1351, 1371, 1391, 1411, 1431, 1451, 1571, 1591, 1511, 1531, 1551, 1571, 1591, and 1611. The channel switching measurement module includes an AD amplification circuit and a photodetector. The channel switching measurement module includes an AD amplification unit and a photodetection unit connected to the AD amplification unit. The photodetection unit includes a channel switching circuit and a plurality of photodetectors connected to the channel switching circuit. Each photodetector correspondingly detects a demultiplexed signal of one wavelength. The AD amplification unit includes a gear switching circuit and an AD amplification circuit connected to the gear switching circuit. The gear switching circuit and the channel switching circuit are connected to the MCU.

[0022] The optical splitter splits the upstream light and downstream light on the main optical path of the WDM network according to a set ratio, and the splitting ratio ranges from 9:1 to 95:5. The optical combiner combines a part of the upstream light and downstream light and sends them into the CWDM module. The filter splits the combined signal, and one photodetector corresponds to detecting the split signal of one wavelength. The MCU controls the gear switching circuit to switch to the photodetector corresponding to the wavelength to be detected, and controls the channel switching circuit to select the amplification factor of the AD amplifier circuit. The split signal is input into the MCU after passing through the AD amplifier circuit. The MCU obtains the analysis results, including the optical power signal and fault information, and stores them in the storage module.

[0023] The human-computer interaction module and the Bluetooth module are connected to the MCU. The wireless communication module is the Bluetooth module, and the model of the Bluetooth module is FSC-BT822. The human-computer interaction module includes a liquid crystal touch screen, a key unit, and an indicator light. The liquid crystal touch screen displays the detected wavelength power value, fault information, and historical records, and sends control instructions to the MCU through the key unit to view the analysis results, select the wavelength to be detected, and set the alarm fault value. The MCU sends the analysis results to the mobile terminal of the staff through the Bluetooth module.

[0024] This embodiment proposes a WDM network fault detection terminal device. The passive optical network is connected in series to the main optical path of the WDM network. The upstream and downstream light on the main optical path of the WDM network are transmitted normally. The passive optical network only obtains a small part of the signal in the main optical path for the CWDM channel analyzer to detect and analyze, realizing the online monitoring of the optical power of each wavelength in the WDM network, with simple operation and not easy to make mistakes.

[0025] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A WDM network fault detection terminal device, characterized in that, it includes a CWDM channel analyzer, a channel switching measurement module, a CWDM module, and a passive optical network connected in sequence. The CWDM channel analyzer is also connected with a wireless communication module and a human-machine interaction module. The CWDM channel analyzer includes an MCU. The passive optical network is provided with two optical fiber interfaces. When in use, the passive optical network is connected in series in the WDM network through the two optical fiber interfaces; the passive optical network includes an optical splitter and an optical combiner. The optical splitter is connected in series in the WDM network through the two optical fiber interfaces. The optical splitter, the optical combiner, and the CWDM module are connected in sequence, wherein the optical combiner is connected in parallel with the optical splitter; the channel switching measurement module includes an AD amplification unit and a photoelectric detection unit connected to the AD amplification unit. The photoelectric detection unit includes a channel switching circuit and a plurality of photodetectors connected to the channel switching circuit; the AD amplification unit includes a gear switching circuit and a plurality of AD amplification circuits with different amplification factors connected to the gear switching circuit; the optical splitter performs optical splitting processing on the upstream light and downstream light on the main optical path of the WDM network according to a set ratio. The optical combiner takes a part of the upstream light and downstream light for optical multiplexing processing and sends it to the CWDM module. The CWDM module demultiplexes the multiplexed signal. One kind of photodetector corresponds to detecting one kind of wavelength of the demultiplexed signal. The CWDM channel analyzer controls the gear switching circuit to switch to the photodetector corresponding to the wavelength to be detected, and controls the channel switching circuit to select the amplification factor of the AD amplification circuit. The demultiplexed signal is input into the MCU after passing through the AD amplification circuit, and the MCU obtains the analysis result, including the optical power signal and the fault information.

2. The WDM network fault detection terminal device according to claim 1, characterized in that, the CWDM module includes a filter.

3. The WDM network fault detection terminal device according to claim 1, characterized in that, it further includes a storage module, and the storage module is connected to the MCU.

4. The WDM network fault detection terminal device according to claim 1, characterized in that, the model of the MCU is MIMXRT1052CVL5B.

5. The WDM network fault detection terminal device according to claim 1, characterized in that, the wireless communication module is a Bluetooth module.

6. The WDM network fault detection terminal device according to claim 5, characterized in that, the model of the Bluetooth module is FSC-BT822.

7. The WDM network fault detection terminal device according to claim 1, characterized in that, the human-machine interaction module includes a liquid crystal touch screen and a key unit.

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